[TD-5998]<fix>:_block_dist() only support tables, not subqueries

src/client/src/tscSQLParser.c

@@ -2045,6 +2045,7 @@ int32_t validateSelectNodeList(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SArray* pS
   const char* msg3 = "not support query expression";
   const char* msg4 = "only support distinct one column or tag";
   const char* msg5 = "invalid function name";
+  const char* msg6 = "_block_dist not support subquery, only support stable/table";
 
   // too many result columns not support order by in query
   if (taosArrayGetSize(pSelNodeList) > TSDB_MAX_COLUMNS) {
@@ -2068,6 +2069,11 @@ int32_t validateSelectNodeList(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SArray* pS
     int32_t type = pItem->pNode->type;
     if (type == SQL_NODE_SQLFUNCTION) {
       pItem->pNode->functionId = isValidFunction(pItem->pNode->Expr.operand.z, pItem->pNode->Expr.operand.n);
+
+      if (pItem->pNode->functionId == TSDB_FUNC_BLKINFO && taosArrayGetSize(pQueryInfo->pUpstream) > 0) {
+        return invalidOperationMsg(tscGetErrorMsgPayload(pCmd), msg6);
+      }
+
       SUdfInfo* pUdfInfo = NULL;
       if (pItem->pNode->functionId < 0) {
         pUdfInfo = isValidUdf(pQueryInfo->pUdfInfo, pItem->pNode->Expr.operand.z, pItem->pNode->Expr.operand.n);

tests/script/general/compute/block_dist.sim

@@ -84,6 +84,10 @@ if $rows != 1 then
   return -1
 endi
 
+print ============== TD-5998
+sql_error select _block_dist() from (select * from $nt)
+sql_error select _block_dist() from (select * from $mt)
+
 print =============== clear
 sql drop database $db
 sql show databases
@@ -91,4 +95,4 @@ if $rows != 0 then
   return -1
 endi
 
-system sh/exec.sh -n dnode1 -s stop -x SIGINT
\ No newline at end of file
+system sh/exec.sh -n dnode1 -s stop -x SIGINT